Elastic wheel-tire.



No. 822,786. PATENTED JUNE 5, 1906 Wr STRUCK.

ELASTIG WHEEL TIREr APPLICATION FILED AUG.22. 1905.

l ITE 'STAES Nr orio.

Specification of Letters Patent.

Application filed August 22, 1905. Serial No. 275.250.

To all whom it may concern,.-

Beit known that'I, WrLHELM STRUCK, a subject of the German Emperor, residing at Berlin, Germany, have invented certain new and useful Im rovements in Elastic Wheel- Tires, of whic the following is a specification, reference being had therein to the accompanying drawing, in which the ure is a.

transverse sectional view of a tire ma e in accordance with my invention.

This invention relates to elastic wheel-tires made of soft india-rubber, with metal hoo s surrounded, as usual, Vby a layer of hard ru ber embedded in the base of the tires. As hitherto made these hoops have been flat or of rectangular section. The irregular formation of the surface of the hard rubber e causes the soft rubber to split oi or separate from the same and to be Worn through in consequence of the strains to whichit is subject in use, especially when the hard rubber forms a sharp ridge, as shown.

The object of the resent invention is to impart during the c osing together of the pressing-molds such a direction to the move ments of the particles of the plastic rubber masses that a displacement of the hard and soft rubber parts relatively to each other and the formation of a sharp ridge are revented. This object isattaine'd, accor ing to the resent invention, b -forming the embedde iron hoop troug -s aped or concave on its tread side or outer circumferences, so that theplastic rubber masses when pressed in the mold are forced into the trough. In consequence of the direction of thepressing forces f (indicated b arrows on the drawing? the formation o a shar ridge of hard ru ber is excluded, especia ly within the trough; At the same time a strong pressure directed rectangularly to the several layers of material is obtained, whereby an excellent adhesion or attachment of the hard rubber to the metal insertion on the one lside and to the soft rubber on vthe other side is obtained.

The iron hoop may be provided in the known manne with hooks or projections g, as shown, in order to obtain a rmer adhesion of the india-rubber thereto.

Havin now particularly described and ascertaine the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is,

1. An elastic solid tire having a metal layer of hard rubber hoop surrounded by a the metal hoop being embedded in its base,

formed concave on the tread or outer circumferential side.

2. The combination with a solid elastic tire, of a metallic hoopl formed concave on its outer circumferential side, and with projections onsaid concave side, said hoop being.

Patented June 5, 1906. 

